[udaaff]

В классе:

import mx.events.EventDispatcher;
//
class SubClass extends XML {
	/*
	*/
	private var dispatchEvent:Function;
	public var addEventListener:Function;
	public var removeEventListener:Function;
	/*
	*/
	public function SubClass() {
		super();
		this.ignoreWhite = true;
		EventDispatcher.initialize(this);
	}
	/*
	*/
	public function onLoad(success:Boolean):Void {
		if (success) {
			var eventObject:Object = {type:"onEvent", target:this};
			dispatchEvent(eventObject);
		}
	}
}

В кадре:

var subClass:SubClass = new SubClass();
//
var listener:Object = new Object();
listener.onEvent = function(eventObj:Object) {
	trace(eventObj.type)
};
subClass.addEventListener("onEvent", listener);
//
subClass.load("my_xml.xml");